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CVE-2026-34500
Authentication Bypass in org.apache.tomcat:tomcat-coyote-ffm (CVE-2026-34500)
Summary
authentication bypass in org.apache.tomcat:tomcat-coyote-ffm (CVE-2026-34500). Confidential information can be exposed externally. Mitigation: upgrade to `11.0.21` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-34500** has been found in org.apache.tomcat:tomcat-coyote-ffm.
Confidential information can be exposed externally. CVSS score: ?/10.
What to do: upgrade org.apache.tomcat:tomcat-coyote-ffm to **11.0.21** or later.
If unsure, ask your IT team or search "org.apache.tomcat:tomcat-coyote-ffm CVE-2026-34500" on the vendor's site.
CVE-2026-34500 (org.apache.tomcat:tomcat-coyote-ffm) — CWE-287 /
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `11.0.21` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**authentication bypass** (CWE-287) exists in org.apache.tomcat:tomcat-coyote-ffm.
📍 Affected scope
org.apache.tomcat:tomcat-coyote-ffm — .
🔥 Severity
Severity: ?. Confidential information can be exposed externally
🔧 How to fix
Update to **11.0.21**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'org.apache.tomcat:tomcat-coyote-ffm' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'org.apache.tomcat:tomcat-coyote-ffm' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `org.apache.tomcat:tomcat-coyote-ffm` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade org.apache.tomcat:tomcat-coyote-ffm to 11.0.21ステージング環境で 11.0.21 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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7Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
maven
org.apache.tomcat:tomcat-coyote-ffm
[{"type":"ECOSYSTEM","events":[{"introduced":"11.0.0-M14"},{"fixed":"11.0.21"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-34500
- package https://github.com/apache/tomcat
- web https://lists.apache.org/thread/7rcl4zdxryc8hy3htyfyxkbqpxjtfdl2
- web http://www.openwall.com/lists/oss-security/2026/04/09/29
- web https://github.com/apache/tomcat/commit/29b56a56ce9e7d044b6162a99af0f38529b3a208
- web https://github.com/apache/tomcat/commit/c13e60e732ea6d07087293a41ad1866c20848271
- web https://github.com/apache/tomcat/commit/ff589ab26e8250a2ca4286d986305318c033ff9f
- web https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.54
- web https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.21
- web https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.117
- web https://github.com/advisories/GHSA-24j9-x2wg-9qv6